The pollution loads of the major rivers flowing into the North Sea are calculated over the period of 1984 to 1987. The loads were calculated on the basis of data as provided by the measuring authorities concerned. For several substances the loads are compared with other sources of pollution.In general it can be stated that the reliability of the loads is rather low. Changes in the annual loads are seldom statistically significant over the period of four years.The highest concentrations are, in most of the cases, found in the river Scheldt. When loads are considered the Rhine and Elbe contribute the largest loads for most of the substances.
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